Read the docs
TI-2026-39978 Aliases CVE-2026-55408

Koodo Reader: Remote code execution via malicious epub file

Priority HIGH 72CWE-94Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Active
Attack complexity
Low
Attack requirements
None
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-94.

Summary

Koodo Reader is an ebook reader. In version 2.3.0 and earlier, Koodo Reader is vulnerable to remote code execution through malicious EPUB files because the open-book IPC handler enables nodeIntegrationInSubFrames and EPUB chapter content is rendered with unsanitized innerHTML. An attacker can craft an EPUB book that, when imported and opened by the victim, instantiates a hidden iframe with Node.js API access and executes arbitrary operating system commands with the victim user's privileges. This issue is fixed in version 2.3.1.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00246 15th percentileScored 2026-11-07
Fix Fixed koodo-reader (koodo-reader): 2.3.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
koodo-readerkoodo-readerbefore 2.3.12.3.1Patch availableCNA
  • koodo-reader Vendorkoodo-reader Affected before 2.3.1 Fixed in 2.3.1 Patch available CNA

Remediation

  • Fix · CNA koodo-reader (koodo-reader) Fixed in 2.3.1

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-55408

References

Other 1

  • TI-2026-84350 Path traversal in Koodo Reader OPDS handlers exposes server files CVSS 4.0MEDIUM 6.9

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences